:7. Solution.  The area under the normal curve between 0 and
1.65 is one half of 90%, or 45%.  The area under the normal curve
between 0 and 0.5 is one half of 38%, or 19%.  So the area under
the normal curve between 0.5 and 1.65 is 45 - 19 = 26%.  The
closest of the choices is 25%. <p>